This normally takes a long time. It is recommended to check the temperature on the transmission oil using a diagnostic scanner to be sure that the transmission oil is heat. Slippage consumes electricity throughout the coupling stage. Locking the converter shell to the turbine shaft stops this slippage from developing. https://torqueconverterclutch10741.thekatyblog.com/32725851/torque-converter-clutch-things-to-know-before-you-buy